SUPER paranoid

When I had been on the pill for a month and a half I think I got precum/ cum on my vagina. I take the pill within 30 kinutes of the same time everyday. After that I had brown discharge 10 days before my next period (I've read this is normal in the first 3 months). Then I had my period for 4/5 days. I've read that you can be pregnant and still get your period but mine seemed normal. I'm just really paranoid. Is there any chance I could be pregnant? I don't really trust BC even though I take it perfectly. Also, I didn't even have sex I just may have gotten some fluid down there. Please help ease my nerves